正規表現をマスターする: Java 開発効率を向上させるためのヒント

public static boolean isValidEmail(String email) {
    String regex = "^[a-zA-Z0-9_+&*-]+(?:\."+
                    "[a-zA-Z0-9_+&*-]+)*@" +
                    "(?:[a-zA-Z0-9-]+\.)+[a-z" +
                    "A-Z]{2,7}$";

    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(email);
    return matcher.matches();
}

public static String replaceText(String text, String pattern, String replacement) {
    return text.replaceAll(pattern, replacement);
}

public static List<String> extractStrings(String text, String pattern) {
    List<String> strings = new ArrayList<>();
    Pattern regex = Pattern.compile(pattern);
    Matcher matcher = regex.matcher(text);

    while (matcher.find()) {
        strings.add(matcher.group());
    }
    return strings;
}

public static boolean isNumeric(String str) {
    String regex = "-?\d+(\.\d+)?";

    Pattern pattern = Pattern.compile(regex);
    Matcher isNum = pattern.matcher(str);
    return isNum.matches();
}

public static boolean isValidIPAddress(String ipAddress) {
    String regex ="^((\d|\d{2}|1\d{1,2}|2[0-4]\d|25[0-5])(\.(?!$)|$)){4}$";

    Pattern pattern = Pattern.compile(regex);
    Matcher matcher = pattern.matcher(ipAddress);
    return matcher.matches();
}